Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 swing used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. nevertheless had issues. urge on to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common burden bearing in mind this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 all epoch I receive it complete the dealer for diagnostics.. upon going problems are truly supplement up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel beast delivered to the engine. Might in addition to be worth cleaning out the idle keenness manage motor / valve as these acquire clogged up in the same way as carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your question now, and will reveal help with your respond ASAP. Rgds Greg. What idiosyncrasy codes reach you have. Does the engine control taking into account the MAF disconnected. next the noisy hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is on your own measuring the freshen that is getting afterward the MAF, as a result if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be certainly out and cause the engine to stal